Carl Friedrich von Siemens (5 September 1872, in Berlin – 9 September 1941, in Heinendorf, near Potsdam) was a German Entrepreneur and politician. A member of the Siemens family, he became associated with Siemens & Halske AG in 1899, his family company. He was responsible for the resurrection of the Siemens Group after the First World War. Before his death in 1941, he oversaw state railways for the Reichstag.
In 1899, Carl Friedrich von Siemens joined the Siemens & Halske AG which was founded by his father and was then led by his elder brothers (today Siemens AG). From 1901 to 1908, Siemens was a director of the British filial Siemens Brothers & Co in London and Siemens Brothers Dynamo Works in Stafford. From 1908 to 1912 he established and led the so-called Übersee-Abteilung which was responsible for the company's activities abroad. He became CEO of the Siemens-Schuckertwerke in Berlin in 1912 and chairman of the supervisory board of both Siemens-Schuckertwerke and Siemens & Halske AG in 1919. In this position he was responsible for the resurrection of the Siemens Group after the First World War. Upon his death in 1941 he was succeeded in both chairmanships by his late brother Arnold von Siemens' eldest son Hermann von Siemens.